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The following are four unexpected, nonintuitive, or weird spin results:
- Swinging upwards and producing backspin. Put the following numbers from top to bottom into the Racquet B boxes: 4, 30, 5, 4000, 30, 45, 0, 21, 0. The result is 522 rpm BACKSPIN.
- Swinging DOWN and prducing topspin. Put the following numbers from top to bottom into the Racquet B boxes: 4, 40, -30, 3000, 40, -5, 0, 21, 0. The result is 99 rpm TOPSPIN.
- Racquet swinging up and ball on the rise producing a "falling" impact angle. Put the following numbers from top to bottom into the Racquet B boxes: 4, 30, 15, 4000, 65, 30, 0, 21, 0. The result is 76 degrees FALLING onto strings.
- Racquet swinging down and ball descending producing "rising" impact angle. Put the following numbers from top to bottom into the Racquet B boxes: 4, 20, -15, 4000, 65, -10, 0, 21, 0. The result is 87 degrees RISING onto strings.
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